(19)
(11) EP 2 270 982 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.06.2016 Bulletin 2016/22

(43) Date of publication A2:
05.01.2011 Bulletin 2011/01

(21) Application number: 10006766.9

(22) Date of filing: 30.06.2010
(51) International Patent Classification (IPC): 
H03H 19/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 02.07.2009 US 497298

(71) Applicant: Broadcom Corporation
Irvine, CA 92617 (US)

(72) Inventors:
  • Mirzaei, Ahmad
    92627 Costa Mesa California (US)
  • Darabi, Hooman
    Irvine, California 92617 (US)

(74) Representative: Jehle, Volker Armin 
Bosch Jehle Patentanwaltsgesellschaft mbH Flüggenstrasse 13
80639 München
80639 München (DE)

   


(54) Frequency translated filters for wideband applications


(57) Embodiments of a SAW-less RF receiver front-end (100) that includes a frequency translated notch filter (FTNF) are presented. An FTNF (400) includes a passive mixer (410) and a baseband impedance (420). The baseband impedance (420) includes capacitors (CBB1-CBB4) that form a low-Q band-stop filter. The passive mixer (410) is configured to translate the baseband impedance (420) to a higher frequency. The translated baseband impedance (420) forms a high-Q notch filter and is presented at the input of the FTNF (400). The FTNF can be fully integrated in CMOS IC technology (or others, e.g., Bipolar, BiCMOS, and SiGe) and applied in wireless receiver systems including EDGE/GSM, Wideband Code Division Multiple Access (WCDMA), Bluetooth, and wireless LANs (e.g., IEEE 802.11). In addition, embodiments of a generalized FTNF for wideband applications are presented.







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